bl V_LOCAL_FUNC(__get_datapage) /* get data page */
cmpldi r11,0 /* check if tv is NULL */
beq 2f
- bl V_LOCAL_FUNC(__do_get_xsec) /* get xsec from tb & kernel */
- lis r7,15 /* r7 = 1000000 = USEC_PER_SEC */
- ori r7,r7,16960
- rldicl r5,r4,44,20 /* r5 = sec = xsec / XSEC_PER_SEC */
- rldicr r6,r5,20,43 /* r6 = sec * XSEC_PER_SEC */
- std r5,TVAL64_TV_SEC(r11) /* store sec in tv */
- subf r0,r6,r4 /* r0 = xsec = (xsec - r6) */
- mulld r0,r0,r7 /* usec = (xsec * USEC_PER_SEC) /
- * XSEC_PER_SEC
- */
- rldicl r0,r0,44,20
- std r0,TVAL64_TV_USEC(r11) /* store usec in tv */
+ lis r7,1000000@ha /* load up USEC_PER_SEC */
+ addi r7,r7,1000000@l
+ bl V_LOCAL_FUNC(__do_get_tspec) /* get sec/us from tb & kernel */
+ std r4,TVAL64_TV_SEC(r11) /* store sec in tv */
+ std r5,TVAL64_TV_USEC(r11) /* store usec in tv */
2: cmpldi r10,0 /* check if tz is NULL */
beq 1f
lwz r4,CFG_TZ_MINUTEWEST(r3)/* fill tz */
.cfi_register lr,r12
mr r11,r4 /* r11 saves tp */
bl V_LOCAL_FUNC(__get_datapage) /* get data page */
+ lis r7,NSEC_PER_SEC@h /* want nanoseconds */
+ ori r7,r7,NSEC_PER_SEC@l
50: bl V_LOCAL_FUNC(__do_get_tspec) /* get time from tb & kernel */
bne cr1,80f /* if not monotonic, all done */
/*
- * This is the core of gettimeofday(), it returns the xsec
- * value in r4 and expects the datapage ptr (non clobbered)
- * in r3. clobbers r0,r4,r5,r6,r7,r8
- * When returning, r8 contains the counter value that can be reused
- */
-V_FUNCTION_BEGIN(__do_get_xsec)
- .cfi_startproc
- /* check for update count & load values */
-1: ld r8,CFG_TB_UPDATE_COUNT(r3)
- andi. r0,r8,1 /* pending update ? loop */
- bne- 1b
- xor r0,r8,r8 /* create dependency */
- add r3,r3,r0
-
- /* Get TB & offset it. We use the MFTB macro which will generate
- * workaround code for Cell.
- */
- MFTB(r7)
- ld r9,CFG_TB_ORIG_STAMP(r3)
- subf r7,r9,r7
-
- /* Scale result */
- ld r5,CFG_TB_TO_XS(r3)
- mulhdu r7,r7,r5
-
- /* Add stamp since epoch */
- ld r6,CFG_STAMP_XSEC(r3)
- add r4,r6,r7
-
- xor r0,r4,r4
- add r3,r3,r0
- ld r0,CFG_TB_UPDATE_COUNT(r3)
- cmpld cr0,r0,r8 /* check if updated */
- bne- 1b
- blr
- .cfi_endproc
-V_FUNCTION_END(__do_get_xsec)
-
-/*
- * This is the core of clock_gettime(), it returns the current
- * time in seconds and nanoseconds in r4 and r5.
+ * This is the core of clock_gettime() and gettimeofday(),
+ * it returns the current time in r4 (seconds) and r5.
+ * On entry, r7 gives the resolution of r5, either USEC_PER_SEC
+ * or NSEC_PER_SEC, giving r5 in microseconds or nanoseconds.
* It expects the datapage ptr in r3 and doesn't clobber it.
- * It clobbers r0 and r6 and returns NSEC_PER_SEC in r7.
+ * It clobbers r0, r6 and r9.
* On return, r8 contains the counter value that can be reused.
* This clobbers cr0 but not any other cr field.
*/
/* Get TB & offset it. We use the MFTB macro which will generate
* workaround code for Cell.
*/
- MFTB(r7)
+ MFTB(r6)
ld r9,CFG_TB_ORIG_STAMP(r3)
- subf r7,r9,r7
+ subf r6,r9,r6
/* Scale result */
ld r5,CFG_TB_TO_XS(r3)
- sldi r7,r7,12 /* compute time since stamp_xtime */
- mulhdu r6,r7,r5 /* in units of 2^-32 seconds */
+ sldi r6,r6,12 /* compute time since stamp_xtime */
+ mulhdu r6,r6,r5 /* in units of 2^-32 seconds */
/* Add stamp since epoch */
ld r4,STAMP_XTIME+TSPC64_TV_SEC(r3)
- ld r5,STAMP_XTIME+TSPC64_TV_NSEC(r3)
+ lwz r5,STAMP_SEC_FRAC(r3)
or r0,r4,r5
or r0,r0,r6
xor r0,r0,r0
bne- 1b /* reload if so */
/* convert to seconds & nanoseconds and add to stamp */
- lis r7,NSEC_PER_SEC@h
- ori r7,r7,NSEC_PER_SEC@l
- mulhwu r0,r6,r7 /* compute nanoseconds and */
+ add r6,r6,r5 /* add on fractional seconds of xtime */
+ mulhwu r5,r6,r7 /* compute micro or nanoseconds and */
srdi r6,r6,32 /* seconds since stamp_xtime */
- clrldi r0,r0,32
- add r5,r5,r0 /* add nanoseconds together */
- cmpd r5,r7 /* overflow? */
+ clrldi r5,r5,32
add r4,r4,r6
- bltlr /* all done if no overflow */
- subf r5,r7,r5 /* if overflow, adjust */
- addi r4,r4,1
blr
.cfi_endproc
V_FUNCTION_END(__do_get_tspec)
git.samba.org / sfrench / cifs-2.6.git / blobdiff